Working hard probably means working smart . 
You can't work hard without knowledge how to work so ware are talking about the same thing with different names.
Yes the two are both important to achieve your goals of success.Working hard with working smart is the best ultimate guide for you to be productive in your field of expertise.Apply them both and you will gain what you have work for. You can't work hard without knowledge how to work so ware are talking about the same thing with different names.